{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["cell line", "RNA", "DNA", "cell type", "protein"], "input": "One of the major objectives in the study of thrombogenesis is to determine the mechanisms by which a hematopoietic progenitor is activated and committed to the megakaryocytic lineage ."}
{"cell line": [], "RNA": [], "DNA": [], "cell type": ["hematopoietic progenitor", "megakaryocytic lineage"], "protein": []}